A Novel Cross-sectional Metallography Method for Determining Hydrogen Absorption Concentration and Hydrogen Absorption Amount of Zr-Sn-Nb Alloy Cladding Caused by High Temperature Water Corrosion

doi:10.11902/1005.4537.2023.008

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (1): 261-266 DOI: 10.11902/1005.4537.2023.008

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A Novel Cross-sectional Metallography Method for Determining Hydrogen Absorption Concentration and Hydrogen Absorption Amount of Zr-Sn-Nb Alloy Cladding Caused by High Temperature Water Corrosion

MA Yan, LAN Yuning(

), CHEN Jiawei

School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206, China

Cite this article:

MA Yan, LAN Yuning, CHEN Jiawei. A Novel Cross-sectional Metallography Method for Determining Hydrogen Absorption Concentration and Hydrogen Absorption Amount of Zr-Sn-Nb Alloy Cladding Caused by High Temperature Water Corrosion. Journal of Chinese Society for Corrosion and protection, 2024, 44(1): 261-266.

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Abstract

Corrosion and hydrogen absorption of zirconium alloy cladding for PWRs is one of the main causes for cladding embrittlement and breakage failure. Therefore, rapid and accurate determination of hydrogen concentrations in zirconium alloys is of great importance to assess the integrity of the cladding. In this paper, we used the RH600/LECO hydrogen analyzer to measure the hydrogen concentration data for several samples of Zr-Sn-Nb cladding, meanwhile the corresponding data of hydrogenated area fraction were acquired by cross-sectional microscopic image measurements. On the bases of the two group of data, a formula was proposed to figure out the distribution of hydrogen concentrations in Zr-Sn-Nb cladding, namely the so called cross-sectional metallography method. This method was validated by using a large amount of known data from the existing literatures. The results showed that the hydrogen concentration values measured by the cross-sectional metallography method were highly accurate, and the error between the hydrogen concentration value and the nominal value is less than 6%.

Key words: Zr-Sn-Nb cladding hydrogen corrosion transverse metallographical method

Received: 13 January 2023 32134.14.1005.4537.2023.008

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(12275083);National Science and Technology Major Project(2019ZX06004009)

Corresponding Authors: LAN Yuning, E-mail: 19897692662@163.com

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.008 OR https://www.jcscp.org/EN/Y2024/V44/I1/261

Fig.1 Microstructure photographs of hydrogen-absorbing samples of Zr-Sn-Nb alloy cladding with 20 μg/g (a), 39 μg/g (b), 74 μg/g (c), 89 μg/g (d), 120 μg/g (e), 160 μg/g (f), 260 μg/g (g) and 320 μg/g (h) hydrogen content

Fig.2 XRD pattern of Zr-Sn-Nb alloy cladding after reaction under high temperature and high pressure

Fig.3 TEM bright field image (a) and corresponding SAED pattern (b) of hydrides in Zr-Sn-Nb alloy cladding after reaction under high temperature and high pressure

Fig.4 Relationship between hydride volume fraction $F$ and area fraction $f$

Fig.5 Micrograph of Zr-Sn-Nb alloy cladding with 130 μg/g (a), 150 μg/g (b), 240 μg/g (c), 360 μg/g (d), 420 μg/g (e), 500 μg/g (f) hydride content^[8,21-23]

Micrograph	$W t H$ / μg·g^-1	Percentage error between $W t H$ and $W t H'$
Fig.5a	129.85	0.12%
Fig.5b	154.64	3.63%
Fig.5c	253.89	5.79%
Fig.5d	375.07	4.19%
Fig.5e	414.31	1.35%
Fig.5f	489.90	2.02%

Table 1 Calculated value of hydrogen content and error analysis based on Fig.5

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